Means for manufacturing composite board structures



G. KHR

June 4, 1946( MEANS FOR MANUFACTURING COMPOSITE BORD STRUCTURES 2 Sheets-Sheet l Filed Aug. 2o, 1941 wml \m N June 4, 194s, G. kH'R 2,401,648 l MEANS FOR MANUFACTURING COMPOSITE BOARD STRUCTURES Patented June 4, 1946 MEANS FOR MANUFACTURING COMPOSITE BOARD STRUCTURES Gustaf Khr, Stockholm, Sweden Application August 20, 1941, Serial No. 407,678 In Sweden February 7, 1941 The present invention relates to the manufacture of boards for that kind, which are composed of a plurality of wood layers glued together and more particularly it has for its object to provide a method of manufacture and an appertaining equipment adapted forthe industrial manufacture of such boards. The invention is substantially characterized by the fact that those parts of which each separate board is to be composed, are placed in a matrix or fixture, in which they are arranged and xed in their proper positions, whereupon they are joined together by gluing in a press, preferably while applying heat to the board. The matrix or ilxture employed may, for example, consist of a box orthe like, open at the top,l the endand side walls of which are` so adjustable that the parts placed in the matrix may be rmly retained by being pressed together between the walls of the matrix.

The invention will be more closely described with reference to the accompanying drawings, in which Figure 1 shows diagrammatically an arrangement according to the invention, intended to be employed in a continuous manufacture of boards of the kind in question,

Figure 2 is a plan view of the matrix in which the boards are manufactured,

Figure 3 is a side view and Figure 4 an end view of said matrix,

Figure 5 is a section along line 5 5 of Figure- 6 on a larger scale,

7 Claims. (Cl. 1114-279) extending in a transversal direction to the board. and a covering layer 52 consisting of veneerhaving its run of grain extending in the longitudinal direction of the board.

The manufacture is carried out in following manner. The parquet lengths 5, 6 are first manufactured in lengths corresponding to the parquet pattern and are given exactly those dimensions they are intended to have in the iinished parquet board. Furthermore, the lengths Il which are intended to form the core layer or illling layer are cut out beforehand. These lengths may be of the same length as the board. 'I hey are suitably provided with transversal incisions which are cut from two ,or more sides in order to prevent casting or` distorting. In the present` case, however, comparatively short lengths Il are used, which are of the same width but may be of varying length, for instance 10 to 20 cm. and whicharerplaced in rows after each vother so as to contact closely with each other at the ends. It should be observed, however, that the lengths in adjacent rows have to overlap each other, so that the ends of the lengths become displaced in relation to each other in the Ilongitudinal direction. Those lengths which Figure 6 shows the tensioning device in plan view, and

Figure 7 is a section along line 'l-l of Figure '6. I

Figure 1 illustrates ithe industrial manufacture "oi' the parquet boards while using matrixes arranged on a horizontal table 2 and-adapted to be capable of displacement' on'the table in the di- I rection of the arrows withthe'aid of a suitable feeding device. The matrix shown on the drawings is a twin-matrix "adapted for the simultaneous manufacture ofthe two boards. It comprises a base plate 2| and four longitudinal bars 19,

20, 22, 23 consisting of angle irons, the two outer bars I9,I 20 of which are fixed, whereas the 'cenbars form two parallel channels vwhich at one end are coniined by transversal angle irons 31, 38

trai bars 22, 23 are laterally displaceable. Said .with grooves or the form the outer edges of the board may, if desired, be made in uninterrupted pieces provided with transversal incisions and being of th-e same length as the board, whereas the remainder of the core layer is composed of short lengths. As shown'in Figure 5, the lengths may be placed in such a way that a slight free clearance is formed between `the rods for the purpose of compensating a possible lateral swelling. In order to facilitate the laying-in of the rods in the matrix it may, however, be suitable to provide the lengths like at their side surfaces facing each other, so that the lengths, upon being introduced into the matrix, may be brought into direct contact with each other in the lateral direction. In most cases, it is sufiicient 'to use for that purpose, in sawing out the lengths along the lateral edges,y a saw with coarse cut, so that the lengths obtain at said sides a rough surface structure which, while at the same time supporting the lengths sideways, still permits a lateral expansion of the lengths caused by moisture, Finally, those pieces of veneer are cut out beforehand, which are designed to form the binding and covering layers 5l, 52.

By using the material thus obtained the boards are manufactured in such a manner that the parquet veneer lengths 5, 6 are first placed on the base plate 2l in the desired pattern between the `irom the magazine 1.

longitudinal bars I8,l 2,0, 22, 2l.- Thereupon the lengths II of the filling layer are laid on the parquet `veneer layer. Simultaneously with or This may be effected by applying a thin lamina or film of glue which is dry at ordinary' temperatures, between the dierent layers. After the various parts have been accurately iitted into their correct positions in relation to one another, the edge bars of the matrix are pressed against the parquet veneer layer so that this layer is iirmly iixed in the matrix. Finally, the veneer layers 5I, 52 are applied which, in addition to the necessary glue layers, are attached tothe lengths I I, for example by means of tacks or pins.

The different parts are thereby fixed relatively to one another. vThe matrix with ther boards thus assembled therein is then introduced into a press, wherein the boards are subjected to heat and pressure, in the course of which the glue melts. After the press plates have cooled down and the glue has set, the matrix is removed from the press.

The introduction of the parquet lengths into the matrix is effected mechanically with the aid of rush rods 3, 4, by means of which groups of parquet lengths 5 and 8. respectively, can be fed forward from vertical stacks of such parquet lengths placed in magazines 1, 8. The parquet lengths are so arranged in each magazine that each layer corresponds to a square in the parquet pattern of the width of the board being produced.

' In the rst working position of the matrix I one of the channels in the matrix is located opposite the magazine 8, which is lled with parquet lengths s disposed in the longitudinal direction of the matrix. zine 8 on the level of the base surface of the matrix there is arranged a table I designed to receive a group of transverse parquet lengths '5 The push rodsv 3 and 4 which are not thicker than the parquet lengths, are so arranged as to advance each time the lowermost layer in the stack. Upon actuation of the push rod 3, three parquet lengths 5 on the table 9 are thus advanced into a position midway between the magazine 8 and one of the channels of the matrix. When the pushrod l is subsequentlyv actuated, said lengths 5 together with the lowermost layer of lengths 8 inthe magazine 8 are pushed into the matrix. This operation is repeated as many times as are necessaryv for the channel in the matrix to be illled with parquet lengths along the whole of its length. After this. the matrix is advanced by a short step so that the other channel comes into position in front of the table 9, which channel is then filled with parquet lengths in the same way as just described.

The matrix is then advanced a long step so that one or its channels comes into position right opposite a table I0, on which the filling lengths II are advanced. Before the last-mentioned lengths are introduced into the matrix, a layer of dry glue is applied to the parquet layer. The

table I0 has the same length as the matrix and is designed to receive all the lengths appertainingl Adisplaced in relation to one another in adjacent rows. This is effected on an endless conveyor -band I2. which is arranged to travel around Between the matrix and themaga.- o

rollers", Il-past a table I8 disposeclon a level therewith on which the lengthsl Il are first placed. After a suillcient number of lengths has been placed on the conveyor band so that the table I0. Putting up the lengths can, if desired, f

be effected whilst the conveyor band is in motion. Situated between the conveyor band and the table III at equal levelwith said table III is a supporting plate I1. Arranged in a narrow intervening space between this plate and the table I8 is an adjustable circular saw Il. After the lengths have been-advanced on the table I0 to contact with the abutment I6 they are severed bymeans of the saw I8 while being suitably retained on the substructure, for instance with the aid of pressing plates or the like. After the abutment has been moved away, the lengths lying on the table l are pushed into the channel of the matrix which is then advanced by a short step, so that the other channel is brought into` the proper position opposite the table I0. Another batch of lengths are now advanced on the table I0, whereupon these lengths are introduced into the other channel of the matrix in the manner 23 are made use of, which' are adjustable in thel transverse direction while being displaceably guided in this direction by means of guides 2l; riveted to the bottom plate 2l,l Figure 7. The lateral displacement of the angle irons is eiected by means of a draught-bar 25 inserted between the horizontal shanks thereof and having a thick ness equal to that of the angle irons. Lateral displacement is eifected by means of a number of balls 21 introduced into recesses 26 between the draught-bar and the angle irons, saldrecesses being provided with oblique `edge surfaces on which theballs are caused to roll up at a pull in the bar 25,the angle irons being then displaced in a lateral direction through a wedge-eilect. The draught-bar 25 is provided at the end thereof with a screw bolt 28 passing through a yoke 28 adapted to abut against the end portions of thev the yoke, VThe displacement of the draught-bar 25 is effected by tightening up the nut 3|,.the

angle irons being then pressed with a pressureof the same magnitude against the layers of veneer in the two channels of the matrix. The draught-bar 25 and the balls are retained in their places by means of a cov er plate 32 which, in turn, is caused to bear on the upper sides of thev draught-bar and the angle irons by means of a number of screw bolts 33 yriveted to the bottom plate 2|, said screw bolts passing through longitudinally extending apertures 3l inthe draughtis to say from the inner side edge.

39 which is pivotally connected with the angle i irons I9, 20 by means of tension bolts 40, 4I and studs 42, 43, arranged in blocks 44, 45 rigidly connected with the angle irons. When the matrix is to be lled, the yoke 39 is suspended on the studs 42, 43 in a position beneath the matrix. Aften the matrix has been lled, the yoke will be raised into a horizontal position, whereupon the yoke is applied to the end portions of the parquet lengths by tightening up the nuts 46, 41, said end portions projecting somewhat outside the matrix.

To retain the upper veneer layers, there may be provided a number of leaf springs on the angle irons I9, 2l), 22, 23 in av manner such that the springs are bentdownwardly in the glue press without interfering with the pressing operation.

The gluing having been effected, the board need not be subjected to any treatment other than that required for making the grooves and tongues in the lengths II forming the longitudinally extending edges of the board. In the example of embodiment illustrated in the drawings,

the board is made in such manner that the layer of parquet veneer is not affected by this Work. To this end, the parquet veneer layer is displaced at the inner longitudinal ledge thereof relatively to the core layer to an extent corresponding to the width of the tongue, which is attained through the arrangement of longitudinally extending bars 36 on the bottom plate 2| inside the xed outer angle irons I9, 20, said bars having a 2. A matrix comprising a bottom plate, adjustable bars extending longitudinally and medially of said bottom plate, stationary walls on said bottom plate arranged opposite said bars and forming two channels therewith, means for retaining said bars in positionV to apply lateral pressure to composite board located in said channels, an adjustable wall at one end of said channels in the form of a yoke, and means supporting said adjustable wall to swing to a position affording end-wise access to the channels, and a stationary wall at the opposite end of said channels.

3. A matrix comprising a bottom plate, a longitudinal stationary wall on said bottom plate, an adjustable bar extending longitudinally of said plate for applying lateral pressure to a composite board located between said wall :and said -bar, a wall at one end of said bottom plate in the form of a yoke, means supporting said adjustable wall to swing to a position affording endwise access to the space between the stationary wall and said bar, and means for adjusting the second mentioned wall for applying end-wise pressure to said composite board.4

4. A matrix comprising a bottom plate, adjustable bars extending longitudinallyy and medially of said bottom plate, stationary walls on said bottom plate arranged opposite .said bars and forming two channels therewith, and meanscommon to theseveral bars for displacing and retaining said bars in position to apply lateral pressure to composite boards located in said channels, said means including a draught-bar, meansfor moving the draught-bar longitudinally, said adjustable and draught-bars having inclined recesses therein and balls cooperating with the walls of said recesses to effect lateral displacement of the adjustable bars in dependence upon longi- 1 tudinal movement of the draught bars.

width corresponding to that of the tongue. The

tongue is then cut out in the side edge of the parquet length to a depthl corresponding to said displacement between the two layers. At the same time the veneer layers 5I, 52 are also severed to a corresponding extent. On the opposite side of the board, a groove is cut in known manner into the side edge of the outer length` II. In order that the tongue shall not be severed by the incisions provided in the ller lengths, it may be found suitable to provide the outer edge lengths I I with incisions from one side only, that 5. A matrix for producing composite boards comprising a bottom plate, adjustable bars extending longitudinally and medially of said bottom plate, stationary Walls on said bottom plate arranged opposite said bars and forming therewith two longitudinally extending channels, -and means for retaining said-bars in position to apply lateral pressure to composite boards located in said channels.

6. A matrix for producing composite boards as claimed in claim 5, characterized by the provision of an adjusting member arranged between said bars.

'7. A matrix for producing composite boards comprising a bottom plate, adjustable bars extending longitudinally and medially of said bottom plate, stationary walls on said bottom plate arranged opposite said bars and `forming therewith two longitudinally extending channels, and

- means cpmmon to the several bars for displacing and retaining said bars in position to apply lateral pressure to composite boards located :in said channels. u

GUSTAF KAHR. 

